My child can't sit up straight and fidgets a lot at school. What is the reason?

Young children entering formal schooling are required, perhaps for the first time ever, to sit and work at a table for fairly long periods of time. To do this easily a child needs adequate flexibility, muscle strength,coordination and postural control.

Children who are fit and flexible naturally sit erect when working at a table.

Children who fidget, move around and slump when sitting often lack the necessary fitness and stamina for sitting; they often find sitting erect causes discomfort in the back and legs.

What is needed for sitting erect with ease and comfort

Hip flexibility to allow the thighs to rest parallel to each other on the seat of the chair with the pelvis vertical.

Trunk flexibility and muscle endurance to keep the trunk erect with ease and comfort.

Neck flexibility and muscle strength to keep the head erect and steady when moving the arms.

Trunk stability: the ability to keep the trunk and head steady when moving the arms.

Why do some children have difficulty sitting erect?

Tightness in the hip muscles

A slumped posture is usually associated with tightness in the muscles that cross from the lower back over the back and sides of the hips.

This tightness makes it difficult and uncomfortable to bend the hips to 900 with the thighs parallel. To compensate the child tips the pelvis backward, flexes the trunk and moves the legs apart and sometimes lifts the heels up. How to check for tight hip muscles

If you ask a child with tightness in the hip muscles to sit erect with the thighs parallel they complain of discomfort in the lower legs and sometimes in the back.

Weakness and poor endurance in the back muscles

When you sit up straight the back muscles must work to keep the trunk erect. If they are weak and have poor endurance sitting erect becomes tiring. The child relieves the discomfort by leaning on the arms when working at a table or may prop up the head with an arm.

Weakness and poor flexibility in the neck muscles

A child who sits with the trunk flexed has to extend the neck to lift the head to see ahead. This leads to tightness in the neck extensor muscles along with weakness in the neck flexor muscles. This combination makes it difficult to hold the head erect when working at a table.

The child may support the head on the hand when the neck muscles get tired.